Motors: expansible chamber type – Three or more cylinders arranged in parallel radial or... – Motive fluid bypass to or from assembly
Patent
1988-03-07
1989-09-12
Freeh, William L.
Motors: expansible chamber type
Three or more cylinders arranged in parallel radial or...
Motive fluid bypass to or from assembly
91494, 91495, F01B 1306
Patent
active
048649163
ABSTRACT:
A hydraulic pump/motor in which working piston elements are arranged for radial reciprocation. A cam is arranged eccentrically to a rotor which carries the pistons. Fluid cavities are provided in feet on the pistons, in the faces of a polygon to which the feet are attacahed, and in bearing pads in the outer ends of the cylinders to provide hydrostatic balancing. The pistons are hollow and are equipped with check valves to prevent centrifugal force from expelling fluid from the polygon and foot cavities. The cam includes mating spherical surfaces which compensate for bending forces applied to the cam. An improved mechanism for adjusting the cam position uses inherent forces to eliminate the need for a power assist device for cam adjustment. Port plates on opposite sides of the rotor provide inlet to the unit near the axis of the unit and outlet near the outer edge to alleviate stresses and increase efficiency.
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